Pine and Spruce Needles Increase Soil Acidity – An Old Wives Tale Debunked

Gardeners all over the internet seem to agree that dead pine and spruce needles have a high acidity and therefore will acidify any soil where they are used as mulch or dug-into the soil to decay and feed the soil for the following year.

But the truth is, while live needles on the tree are in fact acidic and while the fallen, dead needles are somewhat acidic, they decay so slowly that they do not alter soil pH at all or so little that it really doesn’t make any difference. And here’s how I know…

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